Malicious PDF — malware analysis report

Static analysis result for SHA-256 59171ec6a47402f2…

MALICIOUS

PDF

83.1 KB Created: 2021-09-06 01:09:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5efc806d8e6c120814bb56b9eac76ff2 SHA-1: f7e6d7c98fda5583c6bcba7a31997aaa264c9675 SHA-256: 59171ec6a47402f2aa2bed659e238d3f16ad2bd29abfcef29f95cfaeb4a55591
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely to host or redirect to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the final destination and leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2da985e4e---69969126515.pdf In PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/06fcb87218c549b16bd9c50e3b2b6e0d/33798644983.pdfIn PDF document text
    • http://maimungkorn.com/UserFiles/file/23268832105.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/92324457663.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/93075939279.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/71859210311.pdfIn PDF document text
    • http://cogersquest.com/clients/f/f6/f6194b381802d71b6842d6160e8859b1/File/52972628662.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/1933c23a30685c1cdc13da324660139f/davibagekinololot.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610f5de306cf6---gegalukolivuwiropow.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/4528088864.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/tumagudinokifike.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/92144121568.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a692bd4f1---86079434696.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/l60jq40kvssio4o6dhnns51ct5/pozifu.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/vatap.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f6f6ec335f8---jiwalazutov.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/c47387691215e67bd27c02561bb2f575/49332125076.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/59503963535.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16074c062bf9e0---kimiratitowafufan.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/90674623035.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160772d8bc0832---ruresiwubapewuvasejedudix.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/xuputokewedemadowowikesa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=corporate+reorganization+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA40 16860 bytes
SHA-256: 9d7ca3eb74416215dd01ea1d38600578757d9628c5ea04a439291246ee09cc53
font_01_sfnt_off000105b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC9 10548 bytes
SHA-256: 183afae9ea00e3607f28f79c31869a13c80528ce06a201f479a14644dd459ee8
font_03_sfnt_off000135c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C2 1860 bytes
SHA-256: 562d39cc93351683f3420870a5578826c1285db13c691c08f99be18f4980e560

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